Cooling Fan Having a Axial-Air-Gap Motor and a Method for Determining the Dimensional Proportion of the Motor
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United States of America Patent
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Issued Date -
Oct 16, 2014
app pub date -
Feb 7, 2014
filing date -
Apr 10, 2013
priority date (Note) -
Abandoned
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Abstract
A cooling fan having a motor is disclosed. The cooling fan includes a stator assembly and an impeller. The stator assembly includes a shaft-coupling portion and a coil unit. The impeller includes a hub and a magnetic element. An axial air gap is formed between the magnetic element and the coil unit. A height between a bottom face of the shaft-coupling portion and a top face of the hub is from 1.5 mm to 3.5 mm. The coil unit has a first maximum width, and the hub has a second maximum width. A ratio of the first maximum width to the second maximum width is from 0.7 to 1.3. A method for determining the dimensional proportion of the motor includes selecting a ratio of a first maximum width to a second maximum width as 0.7 to 1.3, and determining the values of the first and second maximum widths.
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